(concurring). For reasons given over my signature in Hopkins v. Lake, 348 Mich 382, 391; Conners v. Benjamin I. Magid, Inc., 353 Mich 628 (67 ALR2d 1001), and Nielsen v. Henry H. Stevens, Inc., 359 Mich 130, 133, I hold that the studied injection into this child’s case of the subject of parental fault, contributory or otherwise, constitutes reversible error. My vote to reverse is accordingly cast.